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300MHz to 450MHz High-Efficiency,
Crystal-Based +13dBm ASK Transmitter
Typical Operating Characteristics (continued)
(Typical Application Circuit, V DD = +2.7V, T A = +25°C, unless otherwise noted.) (Note 1)
CLKOUT SPUR MAGNITUDE
vs. SUPPLY VOLTAGE
-40
-43
-46
-49
-52
-55
f RF = 315MHz
2.1
2.4
2.7
3.0
3.3
3.6
SUPPLY VOLTAGE (V)
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
XTAL1
GND
PAGND
PAOUT
CLKOUT
DATA
V DD
XTAL2
FUNCTION
1st Crystal Input. f XTAL = f RF /32.
Ground. Connect to system ground.
Ground for the Power Amplifier (PA). Connect to system ground.
Power-Amplifier Output. The PA output requires a pullup inductor to the supply voltage, which can be
part of the output-matching network to an antenna.
Buffered Clock Output. The frequency of CLKOUT is f XTAL /16.
OOK Data Input. DATA also controls the power-up state (see the Shutdown Mode section).
Supply Voltage. Bypass to GND with a 100nF capacitor as close to the pin as possible.
2nd Crystal Input. f XTAL = f RF /32.
Functional Diagram
Detailed Description
The MAX7044 is a highly integrated ASK transmitter
operating over the 300MHz to 450MHz frequency
DATA
DATA
MAX7044
V DD
GND
band. The IC requires only a few external components
to complete a transmit solution. The MAX7044 includes
a complete PLL and a highly efficient power amplifier.
ACTIVITY
DETECTOR
LOCK DETECT
32x PLL
PA
PAOUT
PAGND
The device is automatically placed into a low-power
shutdown mode and powers up when data is detected
on the data input.
Shutdown Mode
The MAX7044 has an automatic shutdown mode that
XTAL1
XTAL2
CRYSTAL-
OSCILLATOR
DRIVER
/16
CLKOUT
places the device in low-power mode if the DATA input
has not toggled for a specific amount of time (wait time).
The wait time is equal to 2 16 clock cycles of the crystal.
This equates to a wait time of approximately 6.66ms for
a 315MHz RF frequency and 4.84ms for a 433MHz RF
6
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